[1] Some examples of infradian rhythms in mammals include menstruation, breeding, migration, hibernation, molting and fur or hair growth, and tidal or seasonal rhythms.
Several infradian rhythms are known to be caused by hormone or neurotransmitter stimulation or by environmental factors such as the lunar cycles.
[2] The seasonal affective disorder can be classified as infradian, or as circannual, which means occurring on a yearly basis.
[3][4] The most well-known infradian rhythm in humans is the fluctuation of estrogens and progesterone across the menstrual cycle.
[6][7] Other infradian rhythms have been documented in organisms such as dormice, lemmings, voles, lynx, mice, etc.